see url: http://vigilantsolutions.com/
Nice easy solution to the 4th Amendment rights to privacy etc. Camera network spreading all over the USA, sells product to law enforcement as well as business. No need for warrants, for suspicious behaviour, reasonable suspicion, or car tracking...can follow a car almost anywhere, whole thing is recorded.
We have APNR on most major routes in the UK, but owned by the state and is used by law enforcement and for car taxing purposes.